I think HR is just ill equipped for technical interviews, but they try to conduct them regardless.

Was denied a position because HR felt my experience "lacked depth" which I still can't understand 3 years later.

Did the same role at a larger company. Had more responsibility than they were giving me. Developed my own tools for job automation. Grew their business from nothing to half a mil a month. Experienced all stages of growth and realized massive success.

After that interview I kept getting technical interviews and getting passed on because I was too senior for the position